Reason for revert: It broke a downstream build by removing VideoFrame::Copy method. Original issue's description: > Delete method cricket::VideoFrame::Copy. > > Should be unused in Chrome since cl > https://codereview.chromium.org/2068703002/ > > TBR=tkchin@webrtc.org,magjed@webrtc.org > BUG=webrtc:5682 > > Committed: https://crrev.com/9c00f646f0b3cd33506a1944c7bc6724af041237 > Committed: https://crrev.com/7e4e00d189a5dfac2b463a5100ee65ee2f11ed79 > Cr-Original-Commit-Position: refs/heads/master@{#13236} > Cr-Commit-Position: refs/heads/master@{#13244} TBR=pbos@webrtc.org,tkchin@webrtc.org,magjed@webrtc.org,sergeyu@chromium.org,nisse@webrtc.org # Skipping CQ checks because original CL landed less than 1 days ago. NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG=webrtc:5682 Review-Url: https://codereview.webrtc.org/2087923004 Cr-Commit-Position: refs/heads/master@{#13246}